Miner&#39;s pick.



J. W. SHALLENBERGER.

MINERS PICK.

APPLICATION FILED FEB. 13. 1915.

Patented June 6, 1916.

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JOHN W. SHALLENBERGER, OF CANAL FULTON, OHIO.

MINERS PICK.

Application filed February 13, 1915.

To all whom it may concern:

Be it known that I, JOHN W. SHALLEN- BERGER, a citizen of the United States, and resident of Canal Fulton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Miners Picks, of which the following is a specification. I

This invention relates to double-pointed picks of the general type used by coal miners, and one object is to provide an improved and highly eflicient detachable connection between the pick head and the handle. Frequent dressing or sharpening of the pick points is required, and it is necessary to detach the handle in order that the pick head may be conveniently manipulated in the forge. A single handle is ordinarily used interchangeably in connection with a number of pick heads, the miner being'supplied with several sharpened heads any one of which may be substituted for a head that has become dull and requires dressing.

Heretofore much difficulty has been experienced in providing a strong and rigid detachable connection between the handle and the head. The connection is necessarily within a small compass to avoid interference with the side clearance lines of the head, and at the same time must be sufiiciently strong to withstand the heavy work and strains to which the tool is subjected. Absolute rigidity is necessary, and the strength of the comparatively slender pick head must not be impaired in providing the interlocking connection. It is also highly desirable to maintain the full weight of the pick head at its center, and to accomplish this as much metal should be retained at the center as though there were no indentations or other metal displacement incident to providinga handle connection. Such disposition of the metal of the head has been maintained in the present invention, the weight or bulk of the pick head at the center being quite as great as though it were without a handlecoupling formation.

In the accompanying drawings, Figure 1 is a View in perspective of the improved pick head, and Fig. 2 is a similar view of the handle ferrule. Fig. 3 is a view in detail of the wedge-like securing bolt. Fig. 4 is a View partly in elevation and partly in longitudinal section of the head and ferrule connected together, the portion in section being on line H of Fig. 5. Fig. 5 is Specification of Letters Patent.

PatentedJune 6, 1916.

Serial No. 7,953. 7

a cross-section on line 55 of Fig. 4. Fig. 6

is an elevation similar to Fig. l illustrating a modified form. Fig. 71s a longitudinal section similar to Fig. 4, illustrating a m0dified form of bolt connection.

Referring to the drawings, the pick head A is of relatively slender form, being thickest or of largest cross-section at its center and tapering toward opposite ends to form points B. The slender formation is preferable in orderthat the pick head may enter the coal without hindrance, such for instance as would result if the head were formed with a bulging handle-receiving .eye common in similartools used for working in the ground, etc. This requirement precludes the provision of handle-connecting means that projects materially beyond the planes of the even side faces a of the head. To efiect the desired connection a-relativelythin tang C is projected from the center to the inner edge of the head, the opposite fiat faces of the tang being parallel with the longitudinal extent of the head. In the preferred practice, the pick head is forged with tang C projecting therefrom, the metal displaced in forming the tang leaving the V-shaped depressions or cavities D in the opposite side faces a, the apex of each cavity extending toward the front edge a of the head. In the modified construction shown in Fig. 6 the side depressions are rounded as indicated at E. These forged formations provide for the full weight of metal at the center of the head, a feature greatly to be desired and at the same time affords an efficient coupling connection. v

F indicates a portion of the pick handle, and Gris the ferrule in which the handle is secured. The extremity of the ferrule is flattened to a width not exceeding the thickness of the central portion of the pick head and with the extremity portion H of the ferrule cavity shaped to snugly embrace tang C. At opposite sides of the ferrule extremity, Figs. 2 and 4:, are the V-shaped projections D which are formed complementary with and fit depressions D. In the form shown in Fig. 6 the extremity projections are rounded as indicated at E, complementary with rounded depressions E. The end portions J of the ferrule extremity are adapted to bear against the inner edge of the head adjacent opposite ends of tang C at joints J. This elongated bearing materially strengthens the joint between the parts, augmenting the reinforcement resulting from the interlocking formation D, D.

Tang 0 is formed with the elongated bolt passage K and the ferrule has a similar passage L. Adapted to these passages is the wedge-shaped bolt M provided with nut M. With the parts assembled, the bolt passages do not fully aline, so that when the bolt is tightened, as in Fig. 5, a wedging action results which. holds the ferruleextremity in tight engagement with the pick head, and by tightening the bolt from time to time the tightly fitting oint may be permanently maintained. Preferably the head extremity of the bolt is flattened to provide a non-- turning lit in the ferrule passage L. As shown in Figs. 2, 5 and 6, the opposite sides of the ferrule are depressed to provide space for the bolt extremities and nut M within the planes of side faces A of the pick head.

In the construction shown in Fig. 7 the tang-embracing portion of ferrule G- is not reduced in thickness or width in the plane of the securing bolt. Instead, portion N of the bolt passage is threaded to receive the threaded extremity of bolt 0, the latter having a coned portion P which enters the tapered hole K in tang C with a wedging action as the bolt is rotated into its holding position, thereby forcing the ferrule and pick head into tight engagement with each other. The opposite cylindrical extremity 0 of the bolt which fits cylindrical. portion N of the bolt passage is formed with a wrench socket P, whereby there is substantially no projection of the bolt from either face of the ferrule, the length of the bolt being sufficiently less than the length of the bolt passage to provide for the necessary adjustment between the planes of the side faces of the ferrule.

The detachable connection afforded by the improved construction may be quickly and conveniently manipulated for tightening the bolt whenever necessary as well as for connecting and disconnecting the parts. The interlocking formation, and the bearing of the ferrule, including its ends J, against the pick head provides such an expanse of engaging surface as to brace the parts one against the other and effectually resist the strains to which the tool is subjected, at the same time preventing relative movement and hence holding the parts in fixed position. lVith the tang, pick head and ferrule formed of hard steel, practically all the wear is on the bolt, a comparatively inexpensive part that may be readily replaced.

It is quite essential to preserve the strength of the relatively slender pick head, and with the formation herein proposed. the head is in no way impaired. The perforated tang may be conveniently utilized for carrying the head along with others strung on a wire or cord. Heretofore it has not been uncommon to provide the pick head with a perforation specially for this purpose.

I claim:

1. A miners pick head having a projecting tang and abutment-forming ferrulecerr tering flaring depressions in its rear edge at opposite sides of the tang, in combination with a handle ferrule longitudinally and re inovably receiving said tang and provided with end projections formed to fit and center in said depressions and having end edges to engage the abutments formed by said depressions, and fastening means arranged transversely of the tang and ferrule, substantially as described.

2. A miners pick head having a rear tang and depressions in its rear edge at opposite sides of the tang, in combination with a handle ferrule having end edges to abut the rear face of the head at the edges of said tang and at the floors of said depressions and having a longitudinal opening to reniovably receive said tang, said ferrule having end projec ons at the opposite side faces of said tang and corresponding in shape to and fitting in said depressions, the tang and fer rule formed with t'ansverse openings, and a tapered bolt arranged in the openin and adapted to force the ferrule projections into said depressions, substantially as and for the purposes set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN W. SHALLENBERGER.

Witnesses:

A. H. MCCADDEN, C. M. SHAFER.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of reams. Washington, D. C. 

